How do I write small "black board" c1, c2, ... constants?

Question

New for Mathematica 12(?) seems to be a formatted "black board" style of the former C[1], C[2], ... constants in Mathematica 11. How do I type these with formatting at input? C[1] etc. still works, but how to write it formatted? I could not find it in the escape sequence list. TIA.

Carl Woll · Accepted Answer

You could use InputAutoReplacements so that c1 gets automatically converted:
CurrentValue[EvaluationNotebook[], {InputAutoReplacements,"c1"}] = TemplateBox[{"1"},"C"];

or you could use InputAliases so that you need to use the Esc key as usual:
CurrentValue[EvaluationNotebook[], {InputAliases,"c2"}] = TemplateBox[{"2"}, "C"];

How do I write small "black board" c1, c2, ... constants?

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